To cover keys to four sharps and flats, free use of minor keys and modulations, a few chromatic accidentals, quicker movement of notes, more sub-divisions in compound time, independent treatment of inner parts, legato against staccato, couplets of slurred notes in different guises, broader phrases, finer detail within the phrase, varied touches, fuller harmony-chords include octaves, suspensions, easy ornaments. 16-32 bars.